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- places certain stresses upon the intermedi 80 ner gear in the hi hspeed combination is 5 my invention which is ilustrated inthe wasvReissue-tl 21, 1924. UNITED STA G HARLEB S. EVANS, 0F OAKLAND,CALIFORNIA,

DU'IMTIAL COMPANY, 0F OAKLAND.

INGTON.

CALIFORNIA, A CORPORATION 0F WASH- 'IBAN/SMISSION' IIIECHANISM. I

ASSIGNOB T0 THE PERFECTO GEAR i 4(hil'illal No. 1,487,845, .dated lune17, 1924, Serial No. 668,311, ledvOctober 13, 1923. Application forreissue `letl August 85, 1924. Serial No. 734,183. v

Toallwlwmtmayconcem:

Be it known that I, CnAiiLiis S. EVANS, a citizen'of the United States,and a resident of Oakland county of Alameda,-State ofl California, aveinvented a new and'useful Transmission Mechanism, of which the followingis a specification.

My invention l relates to transmission mechanisms-for motor drivenvehicles and particularly to such mechanisms in combi# nation with adifferential system, asis shown in the reissue patent^ to Starr, No.15,424, dated July 25, 1922. Oneof the objects ofthe invention is therevision, in a transmission mechanism of t ey character referred to, ofimproved fi means for connecting the parts together for rotation in thehigh peed combination. vIn prior mechanisms o this type, the ring earmounting or rotor element has been ocked for rotation with thedifferential casin by engagement of the inner gear of the panetarysystem with the differential casing thus preventing rotation of theintermediate gears of the planetary system on theirjournal axes. Thisarrangement ate gears and their mountings which I desire to avoid. It isthe purpose of my invention to provide means whereby the inlookeddirectly to t e ring gear sortliat the driving stress is applied uponboth sides of' each intermediate gear, 'by the interloeked ring gearand..inner\' gear, thus avoiding undesirable stresses which would be aptto causefailure of parts and noisy operation. Another object of theinvention is the provision Vof a more eicient structure at ,a lowermanufacturing cost. v

My invention possesses other objects and features of advantage, some ofwhich, with the fore oing, will be Set forth in the following escriptionof the referred form'of drawing accompanying and forming part of theification.' It is to be understood that do not limit myself to thshowing made by the said drawingand descri tion, I may adopt variationsofthe pre erred form within the scope of my invention as set forth inthe claims.

In the .drawin Figure 1 is a horizontal sectional viewl o? thetransmission embod-V ied' in a rear axle housing, and Figure 2 is asimilar view of a portion of a. modified form lof my invention.V

My invention comprises a housing 2 pro vided with extensions 3 formingthe hou's# ing for the/ rear or driving axles 4-and 5, which extendoutwardly to the driving wheels of the vehicle in which my transmissionmechanism is used. Mounted on the adjacent ends of the alined shafts 4and 5, are 'diiferential'gears 7, connected by differential pinions 8,mounted in the usual way in the diiferential'casing 9. The differentialcasingv is formed with flanges 11 bearing on the differential gears 7 asshown.

Extending laterally from the side ofthe Y differential casing three innumber, `oiieachfof which is journa'led a pinion 13... These pinionsconstitute the intermediate gears of the planetary system. To provide anouter bearing for the studs 12 a ring 14 in which the outer ends ofthestuds are seated, is arranged within the'wear rings 16 and 17, seated inthe cupfshaped member 18, which forms part `of the rotor. The rotorcomprises the cupshaped member 18 on one side and the cupshaped member19 .on the other side, the ring gear 21 of the planetary system, whichis 1n mesh with the intermediate gears 13, being rigidly mounted betweenthe two members, the whole vforming an enclosure for the planetary anddifferential systems. i

The'mem'bers 18 and 19 are provided with'ilanges 22and`23,resf'pectively, form- 1 diate gears 13. Fixed on the rotor is the bevelgear 26 in mesh with the driving pinion 27, whch is fixed on the driveshaft 28. The

rotor or ringgear mounting and the diier.

ential casing may be of the closed or cage type,but suitable aperturesare providedin t ese casings for the free distribution of lubricant tothe bearings.

Means lare provided for locking the iiiare studs 12 preferably the innergear of the planetary ioo 4 the inside ofthe rotor is a lc rine 31 toure 1.

v to effect the planetation of rigi having such character as to be a aptmesh with the teeth of the inner gear when the inner r is moved to theleft of Figand inner gear are vlocked together, and since the teethofthe -inner gear are not disengaged from the teeth of the intermediate'ars, the intermediate gears are held y between the inner and ring gearsand function to transmit the driving stress to the differential casing,so that rotor, inner gear and differential casing are revolved as oneunit. This combination gives the' higldi speed of the transmission.

Vcans are also provided for locking the inner gear to the fixed housing2 so as the intermediate gears and the driving of the diiferential cas-V24 to effect the various combinations ing - which are ada ted to beengag teeth 36 forme externally on the collar 37 41, the proportion andin the low speed combination. Fixed the housing '2- is the locking ring33 teeth 34 with the in formed with internally` extendin which issplined on the outer end of the inner gear sleeve 24. As shown in Figurearra parts is such that both. loc ng rings 31 and A33 may be left freeof engagement with their respective complementary parts, 1n-

which case the transmission is 1n neutral position, or by movement ofthe sleeve 24 thel right, the fixed locking ring is engaged to hold theinner gear stationary, resultin the low speed combination,or by movingthe' sleeve 24 to the left the locking ring' 31 is engaged to eiect thehigh speed combination. In all of these combinations it inner will beunderstoodthat the ar is in mesh with the intermediatee teeth Vbeingwide enuf so that the gear, t

the gear from side to side does shifting of not interrupt theengagement.

for shifting the sleelve escribed. VSlidably mounted in the housingextension 41 is a rack bar 42, provided with an arm '43, engagingin theannular groove Means are provide 44 .formed in the collar 37. The bar 42is moved by-means of a toothed segment 46, provided withy a Iever arm'47" connected by a rod 48 to a suitable actuating lever adjacentthehand of the driver of the vehicle. The bar 42 is also. formedwithnotches 49, so` placed as to correspond with the low and high speedpositions of the bar and adapted tobe engaged by the spring pressed ensuch movement takes place` and the teeth 32 Vare engaged, both rotorment of the pin 51, sothat the bar is retained resiliently in the'position to which it is shifted.

In Figure 2 I hate shown a modified form of my invention in which theinner gear 52 and sleeve 53 are made in two pieces slidably splinedtogether instead of in one piece as in Fi 1, so that the sleeve ma beshifte axially to eiect the speed com ina.- tions without axial movementof the inner gear. The splines 54 on the sleeve comprise the teeth,complementary to and adapted to engage the teeth 3 2 of the lock ingring 31. lIn this case 'the inner gear may float within the intermediategears, 'but preferably I provide bearing surfaces upon the hub of theadjacent differential gear 7 and within the support ring 14 as shown.VExce t for the fact thatthe .sleeve only is shift the teeth 54, insteadof the teeth ,of the inner gear, engaging the lock-y ing ring, theoperation and results of the structure shown in Figure 2 are the same asthose of the structure shown in Figure 1. I claim: 1. The combinationwith a differential gearv system of a planetary gear system includinginner and ring gears and having its intermediate'gears journaled on thediierential casi a fixed element, and means for optionally ocking saidinnergear to said fixed element or to said rin gear.

2. The combination wit a differential f gear' system of a planetary geansystem including inner and ring gears and havin its intermediate gearsjournaled on the di erential casing, a fixed element, a locking rinfixed for rotation with saidri gear, an means for optionallylocking saiinner gear to said fixed element or to said locking ring. 3. Thecombination with a differential gear system of a planetary gear systemcluding inner and ring gears and havi inits `interx'nediate gearsjournaled ony the di erential casing, arotor on =which said 'ring ar ismounted a fixed element, and means or o tionally locking said inner gearto said' ed element or to said rotor.

4. The combination with a dill'erential.

gear system of a planetary gear system in- .cluding inner and ring gearsand havin its intermediate gears journaled on the d1 ential casing, a'rotor on which said ring gear is mounted, a fixed element, a lockingring fixed on said rotor, and means for optionallyv locking said innergear to said xed element or to said'locking ring.

v5. The combination with a dierential gear system of a planetary gearsystem ineluding inner and ring gears and havin its intermediate gearsjournaled on the 4di erential casing, a rotor on which said rin vgear ismounted, a fixed element, clutc members on said rotor and on said fixedelement, complementary clutch 'members Iixed for rotation with saidinner gear, and means clutch members wit for o 'onall said inner r pu yeithger said rotor claembers or said fixed element clutch memrs. `6.Thecombination with a diferential system of a planetary gear systeminuding inner and ring gears and ha its intermediate gears journaled onthe di erential casing, a fixed element, a rotor enclosing the mid gearsystems and on which saidring arismounted,atoothedring fixed on saidrotor, a toothed ring fixed on said fixedV element, complementary teethon said inner r, and means for optionally engaging ei er toothed ringwith said complementary teeth. 7. The combination with a differentialgleain system of a planeta gear system nu an inner gear an a gear ordriving both systems and interiiiiate journ on the dierential casin a edelement, and clutch mechanism including clutch means movable in onedirection to lock said inner to said fixed element and in the otherirection to lock saidinner gear to said ring r. y

8. The comfbmatil'ielili with a diferential Sar stem o a eta gear systeminudili inner gelayrs and ha its gears ournaled on the di -er.- entialcasing, a x element, a locking ring fixed for-rotation with said ringgear, and a sleeve mounted for rotation with the inner and tionallymovable in one direction lock inner gear to said fixed element and indirection to lock said inner gear to sai locking' r' 9. The comfbfinatlionmgvith a dierential systemo apanetarygearsystem inudinginner andringgears and ha its geaix's ornaled olli the erenti casing' a ement, aocking' fixed for with said ring ar, unitary means for'optionally saidi' rgeartosad'ixed element ortosaid m H'jon with a differential of aplanetarygear, m 1 ncludinginnerandnnggearsandha its gears journaled onthe d1 erentialcasin arotor'casing enclosing said .gw mim whimmidi-inggmis a fixed housing, and means Vfor 'onall locking' saidinner-gear tovsaid `iixpiildhouysingortomdroter ..1

. 11. 'rhs combinacion with i. ai man system of a planetary gear systemin udinginner and ring gears and its intermediate journaled on the dierential casing, a rotor casing c gearandonwhichsaidringnearis mounted,a fixed locking ring, a seco lockonsaidrotorcasin,andasleeve y movablein either ential casing 'said inner drivin ing apron rection to lock'inner gear to either locking ring.

12. The combination with a.- differential cluding inner and ring gearsand having its intermediate gears journaled on the diifera rotorenclosing said gear systems and on which said ring gear ismounted, afixed element, and a clutch sleeve optionally movable in one directionto lock said inner gear to said xed element and in the other -directionto lock said inner gear to said rotor.

13. The combinationwith a differential gear system 0f a planetary gearsystem including inner and ring gears and having its intermediate gearsjournaled on the differential, casing, a rotorcasing enclosing both gearsystems and on whichsaid ring gear is mounted, a hlousing'enclosiirigthe rotor casing, a 'ir ocking rings xed one on the fixed casing and aeeve mounted for rotation with e inner glear and optionally engageablewith either 14. The combination with a differential gear system of aplanetary gear system including, an inner gear and a ring gear for driboth systems and-intermediate gears fjo ed on the differential casing,a. xed.

element, a rotory enclosing both gear systems and on whi said ri r lismounted, and means for optional y `iking said rotor casing.

15. The combination with a diiferential gear system of ya. vplaneta gearsystem including an inner gear an a ring gear for both systems andintermediate gears journ ed on the differential casin a vfixed elementarotor casing enclosing th gear systems and i, on which said ring gear ismounted', a sleeve mounted for rotation with.

said inner gear and extending thru the side ofY said rotor casing,clutch `members on said rotor casing' and on said ixed element, clutchmembers on said sleeve, and means for optionally 1 l lclutch to lock theinner gear to said fixed element or te said rotor casing. Y

16.4 The combination with a differential .gear system of a planetarygear system including inner and ring gears and having its intelmediategears journaled oil the dilii'ii; enti osg ,arotorcas'ing' en osin tgearandonwhichsaidringgearis mounted a iixed housing enclosing the rotorcasin utch members on said rotor and on said 'ed housing, c1utch membersmounted for rotation with said inner gear, vand means for optionally ensaidgear clutch members with said rotor clutch members or said housingclutch members. r

' In\ Itestimony whereof, I have hereunto subscribed mynamethis 19th dayof August,

CHARLES S. EVANS.

and the other on the rotorV to said fixed velement or to ios

